I came across the rumor @ the iphoneblog, one user is claiming the reason why users are having so many issues with the 3.0.1 and 3.1 updates is that Apple purposefully included software to "break" jailbroken phones, essentially rendering them useless, and this is the cause of users signal issues etc.
Whether or not there is any truth to this is another story, but does kind of sound like Apple.
Whether or not there is any truth to this is another story, but does kind of sound like Apple.